package com.cloudlinkin.util.encrypt;


import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

/**
 * AES的加密和解密
 * @author usktyec
 */
public class Aes {
    //密钥 (需要前端和后端保持一致)
//	public static final String KEY = ConstantForApp.HFX_YIQISHANGDAXUE_APPKEY_TEST.substring(0,16);
    //算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";
    
    public static String Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            System.out.print("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new String(Base64.encodeBase64(encrypted));
       // return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

    // 解密
    public static String Decrypt(String sSrc, String sKey) throws Exception {
        try {
            // 判断Key是否正确
            if (sKey == null) {
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) {
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = Base64.decodeBase64(sSrc.getBytes());
           // byte[] encrypted1 = Base64.decode(sSrc);//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,"utf-8");
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        /*
         * 此处使用AES-128-ECB加密模式，key需要为16位。
         */
        String cKey = "07720b6a01814393";
        // 需要加密的字串
        String cSrc = "15011307212";
        System.out.println(cSrc);
        // 加密
        String enString = Aes.Encrypt(cSrc, cKey);
        System.out.println("加密后的字串是：" + enString);

        // 解密
        String DeString = Aes.Decrypt("RZv/Accl/+EMidnZZBFYEw==", cKey);
        System.out.println("解密后的字串是：" + DeString);
    }
}